Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Elizabeth Mattes Nielsen, MD

Individual provider Critical Care Medicine (Internal Medicine) Physician · NPI 1861842007

Elizabeth Mattes Nielsen, MD is registered under Hospice/Palliative Care in Wauwatosa, Wisconsin. Qualified in 2015, 11 years ago. Practices with Midwest Critical Care SC, a 45-clinician group, works from 4 locations and accepts Medicare assignment. Licensed in Illinois, Indiana and Wisconsin.

Years since qualifying
11
Licensed in
IL, IN, WI
In the registry since
2016
Specialties on file
6
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1155 N Honey Creek Pkwy
Wauwatosa, WI 53213-3189
Phone: (414) 615-5900
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (3)

  • 2300 N Edward St, Decatur, IL 62526-4163 — (217) 876-4200
  • Memorial Medical Ctr, Springfield, IL 62781-0001 — (217) 545-0193
  • 725 American Ave, Waukesha, WI 53188-5031 — (262) 928-3000

Specialties & licences

Pulmonary Disease Physician (primary) Taxonomy 207RP1001X · Licence 76831 (WI)
Critical Care Medicine (Internal Medicine) Physician Taxonomy 207RC0200X · Licence 036147784 (IL)
Critical Care Medicine (Internal Medicine) Physician Taxonomy 207RC0200X · Licence 76831 (WI)
Pulmonary Disease Physician Taxonomy 207RP1001X · Licence 036147784 (IL)
Internal Medicine Physician Taxonomy 207R00000X · Licence 125.068567 (IL)
Internal Medicine Physician Taxonomy 207R00000X · Licence 01089069A (IN)

Record details

NPI number1861842007
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorYes
NPI enumeratedJune 19, 2016
Last updated in NPPESJuly 14, 2026
Certification dateJuly 14, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyHOSPICE/PALLIATIVE CARE
Also practisesINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2015 (11 years in practice)
Group practice Midwest Critical Care Sc — 45 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients164
Services billed 365 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $250 2 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Midwest Critical Care SC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 45 clinicians in the practice; 12 are shown here.